2.2.0.7 true Goodwill, Intangible Assets and Impairments (Details) (USD $) 40604 - Disclosure - Goodwill, Intangible Assets and Impairments (Details) true false In Millions false false 1 USD false false Unit13 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 Unit12 Standard http://www.xbrl.org/2003/instance pure xbrli 0 Unit1 Standard http://www.xbrl.org/2003/instance shares xbrli 0 Unit14 Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares xbrli 0 $ false 2 USD false false Unit13 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 Unit14 Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares xbrli 0 Unit1 Standard http://www.xbrl.org/2003/instance shares xbrli 0 $ false 3 USD true false false false duk_DukeEnergyMember dei_EntityByLocationAxis xbrldi http://xbrl.org/2006/xbrldi duk_DukeEnergyMember dei_EntityByLocationAxis explicitMember Unit13 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 4 USD true false false false duk_UsfeGMember us-gaap_GoodwillBySegmentAxis xbrldi http://xbrl.org/2006/xbrldi duk_UsfeGMember us-gaap_GoodwillBySegmentAxis explicitMember Unit13 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 5 USD true false false false duk_UsfeGMember us-gaap_GoodwillBySegmentAxis xbrldi http://xbrl.org/2006/xbrldi duk_UsfeGMember us-gaap_GoodwillBySegmentAxis explicitMember Unit13 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 6 USD true false false false duk_CommercialPowerMember us-gaap_GoodwillBySegmentAxis xbrldi http://xbrl.org/2006/xbrldi duk_CommercialPowerMember us-gaap_GoodwillBySegmentAxis explicitMember Unit13 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 7 USD true false false false duk_CommercialPowerMember us-gaap_GoodwillBySegmentAxis xbrldi http://xbrl.org/2006/xbrldi duk_CommercialPowerMember us-gaap_GoodwillBySegmentAxis explicitMember Unit13 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 8 USD true false false false duk_CommercialPowerMember us-gaap_GoodwillBySegmentAxis xbrldi http://xbrl.org/2006/xbrldi duk_CommercialPowerMember us-gaap_GoodwillBySegmentAxis explicitMember Unit13 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 9 USD true false false false duk_InternationalMember us-gaap_GoodwillBySegmentAxis xbrldi http://xbrl.org/2006/xbrldi duk_InternationalMember us-gaap_GoodwillBySegmentAxis explicitMember Unit13 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 10 USD true false false false duk_InternationalMember us-gaap_GoodwillBySegmentAxis xbrldi http://xbrl.org/2006/xbrldi duk_InternationalMember us-gaap_GoodwillBySegmentAxis explicitMember Unit13 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ 5 Goodwill before accumulated impairment charges 3 duk_GoodwillBeforeAccumulatedImpairmentCharges duk false debit instant Goodwill before accumulated impairment charges false false false false false false false false false false false label false 1 true true false false 4728000000 4728 false false false 2 true true false false 4721000000 4721 false false false 3 false false false false 0 0 true false false 4 true true false false 3483000000 3483 true false false 5 true true false false 3483000000 3483 true false false 6 false false false false 0 0 true false false 7 true true false false 940000000 940 true false false 8 true true false false 940000000 940 true false false 9 true true false false 305000000 305 true false false 10 true true false false 298000000 298 true false false xbrli:monetaryItemType monetary Goodwill before accumulated impairment charges No authoritative reference available. false 6 Goodwill impairment charges 3 us-gaap_GoodwillImpairmentLoss us-gaap true debit duration No definition available. false false false false false false false false false false true negated false 1 false true false false -500000000 -500 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false true false false -500000000 -500 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false xbrli:monetaryItemType monetary Loss recognized during the period that results from the write-down of goodwill after comparing the implied fair value of reporting unit goodwill with the carrying amount of that goodwill. Goodwill is assessed at least annually for impairment. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -Subparagraph e(2) Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 43 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 47 -Subparagraph b Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 20 false 7 Goodwill Accumulated Impairment Charges 3 duk_GoodwillAccumulatedImpairmentCharges duk false credit instant Goodwill Accumulated Impairment Charges false false false false false false false false false false true negated false 1 false true false false -871000000 -871 false false false 2 false true false false -371000000 -371 false false false 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false true false false -871000000 -871 true false false 8 false true false false -371000000 -371 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false xbrli:monetaryItemType monetary Goodwill Accumulated Impairment Charges No authoritative reference available. false 8 Foreign Exchange and Other Changes 3 us-gaap_GoodwillTranslationAndPurchaseAccountingAdjustments us-gaap true debit duration No definition available. false false false false false false false false false false false terselabel false 1 false true false false 7000000 7 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false true false false 7000000 7 true false false 10 false false false false 0 0 true false false xbrli:monetaryItemType monetary Reflects net changes to the recorded value of goodwill for foreign currency translation adjustments and purchase accounting adjustments needed to revise the carrying amount of goodwill to fair value. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 false 9 Goodwill 3 us-gaap_Goodwill us-gaap true debit instant No definition available. false false false false false false false false false false false label false 1 false true false false 3857000000 3857 false false false 2 false true false false 4350000000 4350 false false false 3 false false false false 0 0 true false false 4 false true false false 3483000000 3483 true false false 5 false true false false 3483000000 3483 true false false 6 false false false false 0 0 true false false 7 false true false false 69000000 69 true false false 8 false true false false 569000000 569 true false false 9 false true false false 305000000 305 true false false 10 false true false false 298000000 298 true false false xbrli:monetaryItemType monetary Carrying amount as of the balance sheet date, which is the cumulative amount paid, adjusted for any amortization recognized prior to adoption of FAS 142 and for any impairment charges, in excess of the fair value of net assets acquired in one or more business combination transactions. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 43 false 10 Pre-Tax Impairment Charges 3 duk_PreTaxImpairmentCharges duk false debit duration Pre-Tax Impairment Charges false false false false false false false false false false false label false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false true false false 42000000 42 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false true false false 160000000 160 true false false 7 false false false false 0 0 true false false 8 false true false false 42000000 42 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false xbrli:monetaryItemType monetary Pre-Tax Impairment Charges No authoritative reference available. false 11 Net carrying amount of intangible assets 3 us-gaap_IntangibleAssetsNetExcludingGoodwill us-gaap true debit instant No definition available. false false false false false false false false false false false terselabel false 1 true true false false 489000000 489 false false false 2 true true false false 593000000 593 false false false 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false xbrli:monetaryItemType monetary Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 42, 45 false 10 7 false Millions UnKnown UnKnown false true